Headphone PCBA with wireless charging refers to the printed circuit board assembly in headphones that enables wireless charging functionality. Here is a detailed introduction:

　　Composition

　　Power Management Circuit: It is responsible for converting the input power. It can convert the alternating current from the wireless charging base into direct current and regulate it to the appropriate voltage and current required by the headphone's battery, typically 3.7V or 4.2V for lithium - ion batteries. It also features protection functions such as over - voltage protection, over - current protection, and short - circuit protection to ensure the safety and stability of the charging process.

　　Wireless Charging Receiver Circuit: Consists of a receiving coil and related control chips. The receiving coil can generate an induced electromotive force through electromagnetic induction when it comes into contact with the magnetic field emitted by the wireless charging base, thereby converting the magnetic energy into electrical energy. The control chip is responsible for controlling the charging process, such as adjusting the charging rate and monitoring the charging status.

　　Microcontroller Unit (MCU): Monitors and controls the entire charging process. It communicates with the power management circuit and the wireless charging receiver circuit to understand the charging status of the battery, such as the battery voltage, current, and temperature. Based on this information, it can control the charging process to ensure that the battery is charged safely and efficiently. Additionally, the MCU can also interact with the headphone's main control chip to display the charging status on the headphone, such as through indicator lights or on - screen displays.

　　Battery: Usually a lithium - ion battery or a lithium - polymer battery, which is used to store the electrical energy converted by the wireless charging receiver circuit for powering the headphones. The capacity and type of the battery affect the playback time and charging time of the headphones.

　　Working Principle

　　Power Transmission: When the headphones are placed on the wireless charging base, the charging base emits a high - frequency alternating magnetic field. The receiving coil in the headphone PCBA picks up this magnetic field and generates an alternating current through electromagnetic induction.

　　Rectification and Voltage Regulation: The alternating current generated by the receiving coil is converted into direct current through a rectifier circuit and then regulated to the appropriate voltage by the voltage regulator circuit to charge the battery.

　　Charging Control: The MCU monitors the charging status of the battery in real - time and controls the charging process according to the set charging algorithm. For example, when the battery voltage is low, it will increase the charging current; when the battery is almost full, it will reduce the charging current to prevent overcharging.

　　Status Indication: The MCU can send the charging status information of the battery to the indicator light or display screen of the headphones to inform users of the current charging status, such as whether the charging is in progress, completed, or if there is a charging fault.

　　Advantages

　　Convenience: Users only need to place the headphones on the wireless charging base to charge, eliminating the need to plug in charging cables, which is more convenient and quicker, especially in scenarios where the charging cable is inconvenient to use, such as when the headphone cable is short or in a messy environment.

　　Aesthetics and Durability: Without the need for a charging port, the appearance of the headphones is more streamlined and beautiful. Additionally, the absence of a charging port reduces the risk of damage to the port caused by frequent plug - ins and outs, thereby improving the durability and reliability of the headphones.

　　Versatility: Wireless charging technology is gradually becoming standardized, and headphones with wireless charging PCBA can be charged using various wireless charging bases that comply with the relevant standards, providing users with more charging options.